TY - JOUR TI - A communication-free reactive-power control strategy in VSC-HVDC multi-terminal systems to improve transient stability JO - Electric Power Systems Research A1 - GarcĂ­a-Cerrada, A., Renedo, J., Rouco, L., Sigrist, L. VL - 174 IS - PY - 2019-09-01 PS - 105854-1 EP - 105854-13 DO - 10.1016/j.epsr.2019.04.032 AB -

This paper proposes a new reactive-power control strategy for High Voltage Direct Current multi-terminal systems with Voltage Source Converter stations (VSC-HVDC) to improve transient stability in electric power transmission systems. The proposed algorithm uses local measurements to estimate, in each converter station, a weighted average of the frequencies seen by the VSC stations of the HVDC multi-terminal system. This estimation is carried out making use of a (small) auxiliary local active-power modulation along with the DC-side voltage droop control in the VSC stations, where the latter also uses local measurements only. The estimated frequency is used as the set point for supplementary reactive-power control at each converter station. The proposed control law has been simulated in a test system using PSS/E and the results show that it improves transient stability, significantly, producing similar results to those obtained controlling reactive power using global measurements.

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